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UP FOR THE CUP

Spanish ace Marcos Alonso sometimes struggled in a flat back four so must adapt

FULL-BACKS

They will have to adjust most to the change in system — but only when the ball is on the opposite flank. When Chelsea are defending down their right, Marcos Alonso has to make sure he gets inside the far post.

Last season there would have been a third centre-back to pick up there but now it falls to him, or Cesar Azpilicueta on the other side. Alonso has struggled at times in a four.